Respiratory Infections and Vitamin C

Practitioner Guidance

The Condition

Respiratory infections include colds, sinusitis, bronchitis and pneumonia.

Patients may be recovering from acute infections, have recurrent infections, or chronic sinusitis or chronic lung conditions which make them more prone to respiratory infections.

What the Research Says

Much of the research about vitamin C and respiratory infections was done using oral vitamin C.

  • One study of 57 elderly people admitted to hospital with bronchitis or pneumonia found that those who were given vitamin C supplementation had a significantly lower respiratory symptom score and mortality compared to those who received standard care. 1
  • A Cochrane systematic review of 31 placebo-controlled trials confirmed that regular vitamin C supplementation consistently reduces both duration and severity of the common cold. 2
  • A randomised controlled trial of 674 military recruits found that vitamin C supplementation can significantly reduce the incidence of pneumonia. 3


1) The clinical effects of vitamin C supplementation in elderly hospitalised patients with acute respiratory infections. International Journal for Vitamin and Nutrition Research.

2) Vitamin C for preventing and treating the common cold. Cochrane Database of Systematic Review.

3) Vitamin C prophylaxis in marine recruits. JAMA.

The information provided here is only for general reference and cannot replace personalised professional medical advice from a doctor.

Introductory Material

The following articles cover our main products and a sample of conditions. For more detailed materials, please refer to our Knowledge Base.

Vitamin C

EDTA Chelation